prototypal inheritance with extends - Node.js Object

Node.js examples for Object:Prototype

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Description

prototypal inheritance with extends

Demo Code


Object.prototype.extends = function (properties) {
    function f() {};
  var prop;//from   www .  j  a v a  2 s  .  c o m
    f.prototype = Object.create(this);
    for (prop in properties) {
        f.prototype[prop] = properties[prop];
  };

  f.prototype._super = this;
  return new f();
}

var person = {
  init: function init(name, age) {
    this.name = name;
    this.age = age;
    return this;
  },

  introduce: function introduce() {
    return 'I\'m ' + this.name + ", Age: " + this.age;
  }
};

var student = person.extends({
  init: function init(name, age, grade) {
    this._super.init.call(this, name, age)
    // this._super.init(name, age); - name and age do not display in object
    // person.init.call(this, name, age); - Working
    
    this.grade = grade;
    return this;
  },

  introduce: function introduce() {
    return this._super.introduce.call(this) + ", Grade: " + this.grade;
  }
})

var p = Object.create(student).init("Pesho", 13, 2);
var a = Object.create(person).init("Niko", 11);
console.log(p.introduce());
console.log(p);
console.log(a.introduce());
console.log(a);

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